I have an older Duotherm air conditioner. On our last trip a couple weeks ago I noticed lots of condensation around the panel in the ceiling. I pulled the panel and found the baffles directing the air...
Really all you can do is get a less restrictive filter.
Other than that you can run without a filter and run a separate standalone fin and filter. Although you asked what you can do to keep the filter so only the first applies.
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